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bug fix in the data received from cache processing (#6002)

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The patch addresses #3745.

The cache should return the exact amount of data requested by the buffer.
By construction of the cache it is always all requested data range
or we have error happening.

The old use of minsize miscalculate the requested data size,
if non zero offset is requested.
This commit is contained in:
Eugeniy E. Mikhailov 2024-09-10 16:30:18 -04:00 committed by GitHub
parent d660d5c7d4
commit c04edeed68
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GPG Key ID: B5690EEEBB952194
1 changed files with 5 additions and 5 deletions
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10
weed/util/chunk_cache/chunk_cache.go
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@ -57,7 +57,7 @@ func (c *TieredChunkCache) ReadChunkAt(data []byte, fileId string, offset uint64
if err != nil {
glog.Errorf("failed to read from memcache: %s", err)
}
if n >= int(minSize) {
if n == int(len(data)) {
return n, nil
}
}
@ -65,24 +65,24 @@ func (c *TieredChunkCache) ReadChunkAt(data []byte, fileId string, offset uint64
fid, err := needle.ParseFileIdFromString(fileId)
if err != nil {
glog.Errorf("failed to parse file id %s", fileId)
return n, nil
return 0, nil
}
if minSize <= c.onDiskCacheSizeLimit0 {
n, err = c.diskCaches[0].readChunkAt(data, fid.Key, offset)
if n >= int(minSize) {
if n == int(len(data)) {
return
}
}
if minSize <= c.onDiskCacheSizeLimit1 {
n, err = c.diskCaches[1].readChunkAt(data, fid.Key, offset)
if n >= int(minSize) {
if n == int(len(data)) {
return
}
}
{
n, err = c.diskCaches[2].readChunkAt(data, fid.Key, offset)
if n >= int(minSize) {
if n == int(len(data)) {
return
}
}